sleep_fraction() { /usr/bin/perl -e "select(undef, undef, undef, $1)" ;} sleep_fraction 0.01428




if [ 5 -le 3 ] ; then
    echo '5 < 3'
fi

TEST="Some numbers 12345 and special char *&^%$#"; if [[ $TEST =~ ^[[:alnum:][:blank:][:punct:]]+$ ]]; then echo merkit kelvollisia; else echo kelvottomia merkkejä; fi

if [ $foo -ge 3 ]; then ,.fgböflhäwemkö; fi tämä kirjoitetaan nykyään: [[ $foo -ge 3 ]] && fgniornginer || jkvdfvnijnfv
sama kuin: if (( $foo <= 3 )); then   

count=99; if [ $count -eq 100 ]; then echo "Count is 100"; else echo "Count is not 100"; fi
